Plate-stop.



IINITFM @VIAIFS PATENT FFI@F.

OSCAR nOnsEN, or NEW YORK, N. Y., AssreNen iro n. non nur) eo., 'en New YORK, N. Y.,

A ooRronnTrolN or New YORK. i

PLATE-error.

lessees.

Speccation of Letters Patent. Pgwntd July 1"?, i917.

Application. slee November 4, 191e. serial No. 129,422.

rIhis invention relates to certain improve-v ments in plate-supports for printing machines.

In printing machines, and particularly rotary machines in which the form-carryingy member is a cylinder, stops or bars are provided extending longitudinally of the cylinder against which one edge of the plate abuts, the plate then being clamped in position by the side clamps `and held inr position against the bar or abutment by the rotation of the cylinder. It frequently happens, through carelessness of the pressman in putting the plate on the cylinder', and particularly where the cylinder is in a dark 0r dim location, that the edge of the plate will lap over on top ofthe bar or stop, the plate being then clamped in this wrong position. This results, in many instances, when the cylinder goes on impression, that is, is

brought into Cooperation with its impression cylinder, that the edge of such cylinder is broken, thus damaging the cylinder.

It is an object of the invention to produce an improved construction ,of platecylinder or other plate-support, in which these platestops or bars are employed, in which the bar will be so mounted that it may have a limited vertical movement with respect to the cylinder or other support, so that if accidentally a plate is so positioned on the cylinder as to lap over onto the bar, the pressure of the plate on the bar, when the plate goes on impression, will causethe lbar to move toward the surface of the plate and will thus prevent the cylinder from being damaged. The impression will, of course, be in the wrong place on the sheet or web, which is a signal to the pressman that a plate is wrongly positioned and he can stop the press and correct the error, and the press is not damaged.

It is a further object of the invention to produce such a construction which shall be simple, eflicient for'the purpose intended, ,and easily and .quickly eeeembleef In the drawings are shown various ways ofeffecting the ldesired results. In these drawings f Figure l is a sectional elevation, partly broken away, showing 'one' `construction which may be employed for the purpose Fig. 2 is a cross section taken on the line 2 2 of Fig. l; I j y y Fig. 3 vis. a sectionaly elevation, partly broken away, of apmodified` form of c'oiistruction which mayb'e employed;

Fig; 4 isa cross section of the same, taken on line 4 4 of Fig. 3';

Fig. 5 is a sectional elevation of a further modified form, which may b'e used for the purpose, and

Fig. '6 is a 'cross` section taken on the line 6 6 of Fig. 5. Y

Referring now to these drawings, the invention has been shown as "employed in a rotary machine in which fthe form-carrying member of the printing couple is a cylinder, but it will be understood that the invention might be used in other relationsu Referring now first to Figs. 1 and Q, the

cylinder VC is illustrated as provided with the `usual slot 2 .extending n horizontallyy of the "cylinder 'and substantially the length thereof.I VIn this ,slot is mount-'ed the platestop or bai 3, `against which one 'edve of the plateP may abut, as shown in the orawing, this stop'alcting as an abutment to holdV the plate in position, together with `the usual side clamps employed (not shown).` In accordance with the invention, the plate bar or stop 3 is mountedv so that it lcan have a limited `movement in the slot 2, so that if the plateis accidentally placed lso as t'olie on top of the bar, the bar will Vmove down into the slot and prevent the edges of the plate fromextendi'ng so far above the `surface of the cylinder that the press would be damaged when thrown on impression, and, furthermore, in 'constructions embodying the invention in its best form, the plate stop or bar will be resiliently or yieldingly vmounted in the slot. VVhilethis may be effected in various ways, in the particular construction shown the cylinder C is counterbored to form holes 4 extending below the slot 2 above referred to, a suitable number of these holes 4 being provided to effect the purpose desired. In these holes are arranged springs 5 taking against the bottoms of the slots 4 and the underside 0f the plate stop or bar 3,

this stop or bar thus being yieldingly mounted so that it will be forced down into the slot 2 if a'plateis accidentally positioned so as to lap over ontoit.

In its normal position, and as shown, Vthe rvstop or bar 2 eXtends above the surface of the cylinder a sufficient distance to form a suitable,v stop or abutment for the'plate, but

not a distance as high as the thickness of the plate, so that impression is not interfered 'with when. the form or plate cylinder is thrown into printing relation with the impression cylinder.V While this may be effected inv various ways, thebar is held in thev grooveV against the tension of the spring by headed screws '6l which take against flanged sockets7 suitably located in the bar,

' a suitable *number of these sockets and screws beingk provided, which number'may be va- Y rled.

Referring now to Figs. 3V and 4, a modivved formof securing the bar Vin the cylinder isillustrated, and a somewhat Ymodified form of bar. As usual, the bar y3 is formed atene side with a beveled slotV 8, this being provided to permit a` plate to hetused which has its straight or longest edge beveled. In

this construction the springs are held in "the holes 4"bearing against the bottom of the` bar, as shown. vThe baris, however, provided withsmall grooves 9 cut into its sides,

against whichtake a portion of the heads of l Vheaded screws ,10,l the other partof the screw-head taking in a slot cut in the surface ofthe cylinder. As shown in Fig. 4,

furthermore, these securing screws ex- Y l. tend lengthwise of thecylinder, but are. if

' desired, and as kshown in Fig. 4 indotted 1 lines,.in staggered `Vrelation to` the sides of the bar, thatils Yto say, on alternately opposite sides of the bar.V`V Y Referring to Figs. v5Y and 6 a somewhat I modiiied. construction of Vplate-stop, and

means for securing it in position on the cylinder, are" illustrated. vIn the construction here shown the stop is in the form of a numberof-small stops 12 which project, as shown .in Fig. 6, apsuflicient distance/above the sur- V surround the stem of a screw 16, by which the stops are held in correct position in the cylinder by the head of the screw taking against the upper surface of the web of the H, the stops being free to slide vertically in the counterbores 13.

It will be seen that by the construction above described a very simple and etlicient arrangement has been provided for so mounting the plate-stops or bars in the machine that if a plate is accidentally misplaced in putting it on a press, the barwill yield and prevent damage to the cylinders.

While the invention has been shown in its preferred forms, it will, of course, be understood that other specific forms for effecting the purposes of the invention might be v designed, which would embody the invention, and the invention, therefore, is not limited to thespecific constructions shown and described.

lThat is claimed is:

1. The combination of a printing plate support and a. bar or stop against which a plate may abut when positioned on the support, saidbar or stop being mounted on the support so as to have a -yielding movement relatively thereto.

2. The combination of a` printing plate support, a groove or slot inthe support, and a bar or stop mounted in the groove against which a plate may abut when positioned on the support, said bar or stop being mounted Vso as to have a vertical movement in the slot under the pressure of a plate.

3. The combination of a printing plato support, a groove or slot in the support extending longitudinally thereof, a bar or stop in the groove against which the plate may abut when positioned on the support, and springs against which said bar or stopk abut and which permit the bar to have a vertical movement in the slot under the pressure of a plate.

4. The combination of a support having a curved plate-supporting surface, a groove or slot in the support, a bar or stop in the groove against which a plate may abut when positioned on the support, recesses in the support, and springs in the recesses under the bar for permitting the bar to have a vertical movement in the slot under the pressure of a plate.

In testimony whereof, I have hereunto set my hand.

OSCAR ROESEN.

l(I'opies of -tliis patent may be obtained for five cents each, by addressing the Commissioner of Patents.

, j Washingtolnl). C. 

